288 



DISCOVERY REPORTS 



Charts based on the vertical data 



{a) The eggs 



November-December (p. 291) 



January-February (p. 293) 



March-April (p. 295) 



Gross distribution (p. 297) 

 (b) The deep Hving Nauplii, Metanauplii and First 

 Calyptopes, or total deep living larvae 



November-December (p. 299) 



January-February (p. 301) 



March-April (p. 303) 



Gross distribution (p. 307) 

 The shallow living First to Third Calyptopes 



November-December (p. 309) 



January-February (p. 310) 



March- April (p. 311) 



May-June (p. 317) 



Gross distribution (p. 322) 

 {d) The shallow^ living First to Third Furcilias 



January-February (p. 324) 



March- April (p. 325) 



May-June (p. 328) 



Gross distribution (p. 329) 



{c) 



{e) The shallow living Fourth to Sixth Furcilias 



March-April (p. 332) 



May-June (p. 333) 



July-September (p. 336) 



October-December (p. 337) 



Gross distribution (p. 341) 

 (/) Total eggs and larvae 



November-December (p. 343) 



January-February (p. 344) 



March-April (p. 345) 

 {g) Total surface or shallow living larvae 



November-December — as in (c) 



January-February (p. 346) 



March-April (p. 347) 



May-June* (p. 348) 



July-September* — as in (c) 



October-December* — as in (e) 

 (Ji) Gross distribution of total eggs and larvae all year 

 round (p. 350) 



*The total surface larvae for these periods 

 being also the total larvae 



Charts based on the oblique and horizontal data 



(a) The massed surface larvae 

 January-March (p. 359) 

 April-June (p. 363) 

 July-September (p. 366) 

 October-December (p. 369) 

 January-March (p. 372) 

 Gross distribution (p. 373) 



{b) The small whale food (11-20 mm.) 

 July-September (p. 375) 

 October-December (p. 377) 

 January-March (p. 378) 



April-June (p. 380) 



Gross distribution (p. 382) 

 (c) The staple whale food (over 20 mm.) 



October-December (p. 389) 



January-March (p. 394) 



April-June (p. 399) 



July-September (p. 404) 



Gross distribution (p. 407) 

 {d) Gross distribution of total euphausian surface 



population all year round (p. 410) 



limit of the krill so that a certain number of stations are counted into the ' coverage ' figures which are 

 not strictly within its habitat. Ideally, only those stations within the total habitat should be included, 

 but since there is no clear, and above all no concentric, northern boundary to the distribution of the 

 species it is hard to say which should be included and which should not. However, in its absolute 

 geographical range (p. 60, Fig. 5 a) the krill does extend northwards to the 50th parallel (and even 

 beyond) in the Atlantic sector and coverage south of this latitude does show that it is there, where the 

 hydrology is dominated by the Weddell stream, and there alone, that it ever extends thus far. In other 

 words the coverage figures I present demonstrate conclusively that it is the strength and movement of 

 the great Antarctic surface streams that in one sector or another determine the horizontal range of this 

 species, and produce its essential eccentricity,^ rather than temperature or some other environmental 

 * parameter '. Above all, in so far as they apply strictly to the West Wind drift, they show repeatedly 



See (Fig. 56) the even more striking eccentricity of the circumpolarity of its major concentrations. 



